Cell Biology Essentials

From the study guide

Cell Biology Revision Sheet

1. 📌 Essentials

  • Cells are the basic units of life prokaryotic (bacteria) and eukaryotic (animal, plant).
  • Eukaryotic cells contain a nucleus, mitochond, ribosomes; plant cells have additional cell wall and vacuole.
  • Bacterial cells lack a nucleus, have circular DNA, and plasmids.
  • Microscopes: light microscopes for general observation, electron microscopes for detailed internal structures.
  • Diffusion moves particles from high to low concentration; osmosis is water diffusion across a membrane.
  • Active transport moves substances against concentration gradient, requiring energy.
  • Cell cycle involves growth, DNA replication, mitosis, producing identical daughter cells.
  • Stem cells can differentiate into various cell types; embryonic stem cells are pluripotent.
  • Exchange surfaces (alveoli, villi, gills) are adapted for efficient gas and nutrient exchange.
  • Surface area to volume ratio influences cell efficiency; smaller cells have higher ratios.

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Practice quiz preview

1. What is a key difference between prokaryotic and eukaryotic cells?

2. Which cell structure is primarily responsible for energy transfer through aerobic respiration?

3. Why do smaller cells generally have a higher surface area to volume ratio?

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Flashcard preview

Osmosis — mechanism?

Water diffuses across a semi-permeable membrane from dilute to concentrated solution.

Cell types — differences?

Prokaryotes lack nucleus; eukaryotes have nucleus.

Mitochondria — role?

Site of aerobic respiration and energy transfer.

Cells — basic units of?

Life's basic units

Eukaryotic cells — contains?

Nucleus, mitochondria, ribosomes; plant cells have additional structures

Bacterial cells — lack?

Nucleus, have circular DNA, plasmids

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Frequently asked questions

What does the Cell Biology Essentials study guide cover?

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How many questions are in the Cell Biology Essentials quiz?

The practice quiz has 9 multiple-choice questions, each with an explanation. Use it to check what you know and find your gaps.

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